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Node.js Stream readable.unpipe() Method

  • Last Updated : 12 Oct, 2021
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The readable.unpipe() method in a Readable Stream is used to detach a Writable stream which was previously attached while using the stream.pipe() method.

Syntax:

readable.unpipe( destination )

Parameters: This method accepts single parameter destination which is the destination of writable stream to be detached.

Return Value: It returns stream.Writable i.e, the destination.

Below examples illustrate the use of readable.unpipe() method in Node.js:



Example 1:




// Node.js program to demonstrate the     
// readable.unpipe() method
   
// Accessing fs module
const fs = require('fs');
  
// Constructing readable stream
const readable = fs.createReadStream("input.text");
  
// Constructing writable Stream
const writable = fs.createWriteStream("output.text");
  
// Calling pipe method
readable.pipe(writable);
  
// Calling unpipe method
readable.unpipe(writable);
console.log("done");

Output:

done

Example 2:




// Node.js program to demonstrate the     
// readable.unpipe() method
   
// Accessing fs module
const fs = require('fs');
  
// Constructing readable stream
const readable = fs.createReadStream("input.text");
  
// Constructing writable Stream
const writable = fs.createWriteStream("output.text");
  
// All the data from readable goes into 'output.text',
// for only two seconds.
readable.pipe(writable);
setTimeout(() => {
  console.log('Stop writing to output.text.');
    
  // Calling unpipe method
  readable.unpipe(writable);
  console.log('close the file stream.');
    
  //Calling end method
  writable.end();
}, 2000);
console.log("done");

Output:

done
Stop writing to output.text.
close the file stream.

Reference: https://nodejs.org/api/stream.html#stream_readable_unpipe_destination.




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